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A060848 Difference between a nontrivial prime power (A025475) and the next prime. 0
1, 3, 2, 1, 4, 2, 5, 4, 3, 2, 6, 2, 3, 4, 8, 1, 4, 4, 6, 9, 12, 6, 4, 12, 6, 7, 30, 4, 12, 12, 5, 16, 6, 4, 10, 10, 12, 10, 6, 3, 4, 6, 10, 4, 6, 2, 4, 10, 6, 17, 4, 10, 4, 18, 6, 30, 12, 12, 4, 10, 27, 4, 6, 4, 12, 4, 28, 6, 2, 10, 4, 4, 10, 12, 18, 10, 10, 3, 12, 4, 12, 6, 10, 10, 18, 10, 12 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..87.

FORMULA

a(n)=nextprime[A025475(n)]-A025475(n)=A013632[A025475(n)]

EXAMPLE

78125=5^7 is followed by 78137, the difference is 12; a(n)=1 only for some powers of 2.

CROSSREFS

Cf. A025475, A000961, A001597, A001694, A007917, A007918, A013632, A013633, A049711.

Sequence in context: A264597 A112603 A097294 * A265271 A006020 A294177

Adjacent sequences:  A060845 A060846 A060847 * A060849 A060850 A060851

KEYWORD

nonn

AUTHOR

Labos Elemer, May 03 2001

STATUS

approved

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Last modified December 14 22:42 EST 2019. Contains 329987 sequences. (Running on oeis4.)